Grinding wheel truing apparatus



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C. G. FLYGARE GRINDING WHEEL TRUING APPARTUS swg. 29, 1936.

Fiied Aug. e, 1935 `nnwc. 222222 M w 52 M alu Patented Sept. 29, 1936 UNITED STATESv 2,056,148 Y Y GRINDING WHEEL TRUINGAAPPARATUS Carl G. Flygare, Worcester. Mass., assignor to Norton Company, Worcester, Mass., a corporation of Massachusetts Application August 6, 1935, Serial No. 34,940 l 11 Claims. 1215-11) This invention relates to grinding machines, and more particularly to a grinding wheel truing apparatus for truing the operative face of a grinding wheel.

It is one of the objects of this invention to provide a simplified, thoroughly practicable truing apparatus for truing the periphery of a grinding wheel.

Another object of this invention is to provide a truing apparatus which may be readily attached to or removed from the grinding machine.

Another object of this invention is to provide a truing apparatus for truing the operative face of a grinding machine without the necessity of removing the work piece from its operative position in the machine. f

It is another object of this invention to provide atruing'apparatus which is readily attachable to the'machine and which may be readily adjusted to position the truing tool in a predetermined position relative to the axis of the grinding wheel and the work. v

It is a further object to provide a truing apparatus-with a precision adjusting mechanism having a visible scale by which the truingtool may be readily adjusted in accordance with the size of thework being ground so that the truing tool bears a properrelation with the axis of the work and the grinding wheel. v

The invention accordingly consists in the features of construction, combinations of felements, and arrangements of parts, as will be exemplified in the structure to be hereinafter described, and in the scope of the application of which will be indicated in the following claims.

In the accompanying Ydrawing in which `is shown one of the various possible embodiments of the mechanical features of this invention,

Fig. 1 is anend elevation of the improved truing apparatus; Y f

Fig. 2 is a vertical sectional view taken approximately on the line 2--2 of Fig. 1; Y

Fig. 3 is a fragmentary front elevation of the supporting mechanism for the truing apparatus;

and f Fig. 4 is a fragmentary vertical section, on an enlarged scale, of the truing tool mounted.

The embodiment of the invention selected for illustration comprises a grinding machine base IE! which supports a longitudinally movable work table II on the usual V-way I2 and iiat way I3. The longitudinal movable table II in turn supports a swivel table II4 which is arranged to pivot about a stud or pivot pin I5. The swivel table I4 is `provided with the usual head and footstock members (not shown) which are old and Wellknown features in a grinding machine such as, for example, that shown in the prior Norton Patent' No. 762,838 vdated June 14, 1904. The head and -footstock have not been illustrated in the 5 present case, since they are not considered part of the present invention. A rotatable grinding wheel IBis rotatably mounted inthe usual manner on a transversely movable wheel slide (not shown), for details of which reference maybe yl0 had to the above-mentioned prior patent to Norton. l v- In the grinding of large rolls, such as used in a steel rollingv mill-which frequently Weigh several tons, it is desirable to provide a truing apparatus `l5 which permits the truing of the operative face of the grinding wheel I6 while a roll or work piece I'I is supported in operative position on the tableV I4.

It is desirable to provide a truing apparatus which may be readily positioned Von the machineA or v20 removed therefrom fortruing the operative face of thegrinding Wheel to present'the desired surface for grinding. In the preferred construction, the truing apparatus is supportedby a substantiallyU-shaped frame-29 which is arranged to' 25 straddle the roll. or work piece I'I. The U-shaped frame` 20 is provided with a supporting pad 2I which serves to engage the work piece at a point adjacent to the line of grinding Contact between the wheel I6 and the roll or work piece I1.

The truing tool end of the U-shaped frame 20 is provided with an outwardly extending boss 22 having a cylindrical aperture 23 arranged to receive a truing tool 24 in which is mounted a diamond or other truing medium 25. The holder 24 -35 is held-in adjusted position within the boss 22 by means of a screw 2E, thus permitting the tool to be readily removed from the attachment or inserted therein or adjusted relative thereto,

The other end of the U-shaped frame 20 is ar- 40 rangedto be removably attached to a portion of the machine. In the embodiment of the invention illustrated, the U-shaped frame 20 is preferably removably attachable to the table lI4 by means ofV a stud 28 which is mounted on a trans- 45 versely movable slide 29. The slide 29 is supported on slideways 30 on a supporting frame 3I. The slide 29 is provided with a nut 32 meshing with an adjusting screw 33 which is supported in a bearing 34 on theframe 3l. The screw 33 50 is provided with an adjusting knob 35 mounted on its outer end which serves to rotate the screw 3.3 and through the nut 32 adjust the position of the slide 29 transversely relative to the table I4, the roll I'I and the grinding wheel I6. The frame 55 3| is provided with a dovetailed surface 36 which is arranged to mate with a correspondingly shaped dovetailed surface 31 on the swivel table I4. The frame 3| is clamped in adjusted position on the dovetail 31 by means of a pair of clamping gibs 48 and 4I which have surfaces 42 mating with a portion of the dovetail 31. The clamping gibs are held in place by means of screws 43 and 44 which pass through the clamping gibs 49 and 4I and are screw threaded into the frame 3|.

In order that the truing apparatus may be readily inserted on the machine or removed therefrom after truing, it is desirable to provide a suitable readily detachable connection, such as the pivot pin 28 having end portions which are provided with slabbed-off surfaces 45 and 46. The frame 26 is provided with a cylindrical hole 41 of a diameter equal to the diameter of the stud 28 and its lower portion is provided with an opening 48 which is of a width slightly greater than the distance between the slabbed-o surfaces 45 and 46. When it is desired to remove the truing apparatus from the machine, the frame 28 may be rocked in a clockwise direction (Fig. 1) to swing the opening 48 into alignment with the slabbed-oi surfaces 45 and 46, and the frame 28 may then be moved toward the right, as viewed in Fig. 1, and the entire assembly removed from the machine so that the grinding operation on the roll I1 may be resumed. After the grinding operation has continued and it is desired to again true the wheel, the frame 20 may be readily inserted in its former operating position with the pivot 28 supporting the end of the frame 26 and the pad 2| supporting the other end of the frame in operative position in contact with the roll I1.

In truing the operative face of the grinding wheel, it is desirable that the truing tool 25 engage the periphery of the grinding wheel at a point substantially in a horizontal plane passing through the axes of the wheel and work so that the truing tool passing across the face of the grinding wheel engages the wheel along the line of contact between the grinding wheel and the work piece. This is particularly desirable and necessary in truing a grinding wheel when a roll or work piece is being crowned, that is, when the periphery of the roll is ground to a surface other than a true cylinder. In the grinding of rolls for use in the rolling mills, it is frequently necessary to generate a crown, either the convex or concave, on the surface of the roll so that when the roll is put in operative use in the rolling mill under pressure, the deflection of the roll due to the pressure will roll work of the desired shape and form. If the machine is set up for grinding a true cylinder, the table II is reciprocated longitudinally while the swivel table I4 is clamped in rigid engagement therewith. In such a grinding operation, the periphery of the grinding wheel is trued to present a true cylindrical grinding surface.

When it is desired to set up the machine for a roll crowning operation, a forming or crowning attachment is provided for causing a relative swiveling movement between the longitudinally reciprocable table II and the swivel table I4 so that when the roll being ground is reciprocated longitudinally, the swivel table will be rocked about its pivot I5 so that the desired longitudinal curvature will be produced on the roll being l ground. Such a mechanism has not been illusa part of the present invention. For details of the operation of a mechanism of this type, reference may be had to the prior patent to Dunbar and Flygare No. 1,970,000 dated August 14, 1934. When the machine is operated for roll crowning, as above described, it is desirable that the diamond or truing tool 25 be mounted exactly on the line of centers between the wheel and work axis so that when the diamond is passed across the face of the wheel due to the traversing movement of table I I, any swiveling movement of table I4 will be transmitted to the diamond 25 so as to generate a curved face on the periphery of the grinding wheel.

In order that the truing tool 25 may be maintained in the proper adjusted position relative to the wheel and work axis regardless of the size of the work being ground, an adjustable work engaging and supporting shoe 58 is provided. The shoe 50 is pivotally mounted on a stud 5I which is in turn carried by a pair of guide rods 52 and 53. The rods 52 and 53 slide in holes 54 and 55 respectively in the frame 26. The upper end of the rods 52 and 53 are connected by a head 56 which serves to rotatably support a bearing 51 of a feed screw 58. The upper end of the screw 58 is provided with a knob 59 so that the screw may be readily rotated Within the head 56. The screw 58 meshes or engages a threaded aperture 60 in the frame 20 so that when the knob 59 is turned to rotate the screw 58 within the threaded aperture 60, the shoe 50 will be adjusted vertically relative to the frame 20, as viewed in Fig. 1.

It will be readily apparent from the foregoing disclosure that by rotation of the knob 59, the path of the truing tool or diamond 25 relative to the work and Wheel axes may be varied by vertically adjusting the position of the work engaging shoe 50.

In order that the truing tool 25 may be readily adjusted into its proper position for truing different sizes of rolls, an indicating device is provided Which includes a graduated scale 65 formed on the rod 53. 'I'he upper surface 66 of the frame 20 serves as an index or zero reading. By adjusting the knob 59 so that the proper reading on the scale 65 coincides with the index surface 66 on frame 2D, the position of the truing tool may be readily set, for any given size roll being ground, to coincide with the line of contact between the grinding wheel and work piece.

In the operation of the improved truing apparatus, the supporting frame 3| for the truing apparatus is preferably clamped in a xed position on the swivel table I4 in transverse alignment with the pivot pin I5. When it is desired to true the periphery of the grinding wheel I6, the wheel I6 and work I1 are separated from each other by a distance sufficient to admit the truing apparatus by means of the cross feeding mechanism (not shown). The truing apparatus frame 20 is then lifted into position so that the opening 48 is aligned with the slabbed-off surfaces 45 and 46 and the frame is moved so that the pin 28 engages the cylindrical hole 41 and the frame 20 is then rocked in a counterclockwise direction so that supporting pad 50 rests in operative position on the upper surface of the work I1. The knob 59 is then adjusted for the size of roll being ground so that the diameter of the roll being ground as indicated on scale 65 coincides with the. index surface 66 to position the diamond truing tool 25 on the line of contact between the grinding wheel' and the work piece. The operator then adjusts the knob 35 so as to move the slide 29 and frame 20 toward the right (Fig, 1) so that the supporting pad ZI engages 'the'surface of theroll adjacent the line of contact between the wheel and the roll to hold the frame y2l) rigidly in its truing position. The table II may then be reciprocated either manuallyorbypo-wer by a suitable traverse mechanism (not shown), such as that shownin the prior patent to Norton above referred to. The grinding wheel'may' then be fed into truing position with relation 'to the diamond and the table I I traversedto pass-the diamond 25 across the face of the Wheel I6 until it is trued to the desired surface.

The truing attachment may then bereadily removed from the machinerby turning the vknob .35 to cause the slide 29 and the frame 20 to `move 'a slight distance toward the left (Jig. 1).1- The entire frame Z@ may thenbe swung in a-clockwise direction until the opening 48 is aligned with the slabbed-ol surfaces l5 and 46, and the frame may then be moved toward the right to disengage the pin 28 from the aperture-41 of the frame 20.

It will thus be seen that there has been provided by this invention a grinding wheel truing apparatus in which. the variousobjects hereinabove set forth together with many thoroughly practical advantages are successfully achieved.

As various possible embodiments might be made of the mechanical features of the abo-ve invention and as the art herein described might be varied in various parts, all without departing from the scope of the invention, it is to be understood that all matter hereinbefore set forth or shown in the accompanying drawing is to be interpreted as illustrative and not in a limiting sense.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A roll grinding machine of the type having a rotatable grinding wheel and a rotatable work support which are movable longitudinally and transversely relative to each other, and a truing apparatus comprising a substantially U-shaped frame, a truing tool adjustably positioned at one end of said frame, a work engaging shoe adjacent thereto, and a second work engaging shoe adjustabiy positioned on said frame and arranged to engage the work on its upper surface so as to adjust the position of the frame to Vary the path of the truing tool relative to the grinding wheel.

2. A grinding machine of the type having a rotatable grinding wheel and a rotatable work support which are movable longitudinally and transversely relative to each other, and a truing attachment comprising a substantially U-shaped frame, a truing tool carried at one end of said frame, detachable connections between the other end of said frame and the machine, a work engaging shoe on the tool end of said frame arranged to engage the work at a point adjacent the line of contact between the wheel and work, and a second work engaging shoe adjustably positioned on said frame and arranged to engage the work on its upper surface so as to adjust the position of the frame to vary the path of the truing tool relative to the grinding wheel.

3. A grinding machine of the type having a rotatable grinding wheel and a rotatable work support which are movable longitudinally and transversely relative to each other, and a truing apparatus conprising a substantially U-shaped frame, a truing tool adjustably positioned at one end of said frame, a. work engaging shoe on the tool end of said frame arranged to engage the work at a pointadjacent to the line'of contact between'the wheel. and. work, detachable con.-

nectioris between the other end of said frame and the machine, a second work engaging shoe ladjustably positioned on said frame and arranged to e-ngage theV work-on its upper surface so as to adjust the position of the frame to vary the. positionV of the truing tool Vrelative to the grinding Wheel and work axis, and'anindicating Tdeviceass'ociated with said second shoe to readily 'adjust the position of said truing tool for a predetermined size wcrk piece.

4. A grinding machineof the type having a rotatablegrinding wheel and a Yrotatable work support which are movable longitudinally and transversely relative to eachother, and a grinding wheel truing apparatus therefor comprising a substantially U-shaped frame arranged to straddle the workpiece, a truing tool adjustably mounted on one end of said framea workengaging shoe onsaid frame adjacent to said truing tool whichis arranged to engage the work at a point adjacent tothe line ofcontact between the wheel and work, a transversely movable slide, a detachable connection between the other end of said frame and the transversely: movable slide, and means to adjust the yposition of said slide transversely relative to the table so as to maintain the shoe in supporting contact with the work.

5. A grinding machine of the type having a rotatable grinding wheel, a longitudinally movable work supporting table, a rotatable work support thereon, and a truing apparatus therefor comprising a substantially U-shaped frame arranged to straddle the work piece, a truing tool adjustably mounted at one end of said frame, a work engaging shoe on said frame adjacent to the tool end thereof which is arranged to engage the work at a point adjacent to the line of contact between the wheel and work, a detachable connection between the other end of said frame and the machine, means to adjust the position of said connection transversely relative to the machine so as to maintain said shoe in operative supporting contact with the work, and an adjustable shoe mounted on said frame and arranged to engage the upper surface of the work to permit adjustment of the frame to vary the position of the truing tool relative to the grinding wheel and work aXis,

6. A grinding wheel truing apparatus for a grinding machine comprising a substantially U- shaped frame, a truing tool mounted on one end of said frame, a supporting shoe on said frame adjacent to said tool, a supporting member arranged to be clamped on said machine, a transversely movable slide on said member, detachable connections between the other end of said frame and the slide, and means to adjust the slide to maintain said shoe in an operative position.

7. A grinding wheel truing apparatus for a grinding machine comprising a substantially U- shaped frame, a truing tool mounted on one end of said frame, a supporting shoe on said frame adjacent to said tool, a supporting member arranged to be clamped on said machine, a transversely movable slide on said member, and detachable pivotal connections between the other end of said frame and said slide whereby the truing apparatus may be readily attached or detached before and after a truing operation.

8. A grinding Wheel truing apparatus for a grinding machin-e comprising a substantially U- shaped frame, a truing tool mounted adjacent to one end of said frame, a supporting shoe on Vsaid frame adjacent to said tool, detachable connections between the other end of said frame and the machine, a second supporting shoe adjustably mounted on said frame, and means including an indicating device arranged to adjust the position of said second shoe relative to said frame to accurately position the truing tool for truing the grinding Wheel.

9. A grinding Wheel truing apparatus for a grinding machine comprising a substantially U- shaped frame, a truing tool mounted adjacent to one end of said frame, a supporting shoe on said frame adjacent to the tool, a supporting member arranged to bel clamped on said machine, and detachable connections between the other end of said frame and said member, a second supporting shoe which is interposed between said rst Shoe and the detachable connections, and means including an indicator to adjust the 'position of said second shoe relative to said frame to position the truing tool in a predetermined relation with the Wheel and work to true the same on the line of grinding contact between the wheel and Work piece.

10. A grinding Wheel truing apparatus for a grinding machine comprising a substantially U- to support said tool.

shapedfframa Va truing tool mounted on one end -of said frame, a supporting shoe on said frame adjacent' to said tool, a second supporting shoe adjustably mounted on said frame and arranged to-adjust the position of said tool relative to the grindingl wheel axis, a supporting member arranged to be clamped on said machine, a transversely movable slide on said member, d-etachable connections between the other end of said frame and said slide, and means to adjust the position of said slide to maintain said shoe in an operative position.

-1,1. A grinding Wheel truing apparatus for a 'grinding .machine comprising a substantially U- shaped frame, a truing tool mounted on one endk of said frame, a supporting shoe on said frame adjacent to said tool, a second shoe adjustably mounted on said frame, means including an indicating device to adjust the position of said second shoe'relative to said frame to accurately position the truing tool, a supporting member arranged to be clamped on said machine, a transversely movable slide on said member, detachable pivotal connections between said slide and said frame, and means to adjust the position of said slide to maintain said shoes in operative position CARL G. FLYGARE. 

